# Relationship history for MSHA mine 1301830

Current hierarchy: **Keune Ronald → Keune Construction Company → Earl Roberts Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Keune Brothers Construction Company → Earl Roberts Quarry; 1978-03-09 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Keune Burdette & Gordon → Earl Roberts Quarry; 1978-03-09 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Keune Burdette & Gordon → Keune Brothers Construction Company; 1978-03-09 to 1985-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Keune Construction Company → Earl Roberts Quarry; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keune Ronald → Earl Roberts Quarry; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keune Ronald → Keune Construction Company; 1985-08-01 to current/open; source msha-controller-operator-history